PARK CITY, Utah — The Department of Defense estimates that more than 19,000 military men and women were sexually assaulted by fellow troops in 2010 while serving in the United States armed forces.

These troubling statistics are among those presented in “The Invisible War,” a documentary in competition at the Sundance Film Festival.

The film by writer-director Kirby Dick and producer Amy Ziering examines the epidemic of rape within the military, how it affects victims and why so few cases are prosecuted.

“The Invisible War” includes interviews with rape survivors and their families as well as government and military officials. Politicians such as Sen. Barbara Boxer of California, U.S. Rep. Jackie Speier, Lt. Gov. Gavin Newsom and U.S. Rep. Mike Turner of Ohio attended the film’s premiere in Park City, Utah.